/// <summary>
/// Invoke the middleware.
/// </summary>
/// <param name="context">The http context.</param>
/// <returns>A task that can be awaited.</returns>
public async Task Invoke(HttpContext context)
{
HttpRequest request = context.Request;
bool isPreFlight = HttpMethods.IsOptions(request.Method);
// Attempt to match the path to a batch route.
ODataBatchPathMapping batchMapping = context.RequestServices.GetRequiredService <ODataBatchPathMapping>();
if (!isPreFlight && batchMapping.TryGetRouteName(context, out string routeName))
{
// Get the per-route container and retrieve the batch handler.
IPerRouteContainer perRouteContainer = context.RequestServices.GetRequiredService <IPerRouteContainer>();
if (perRouteContainer == null)
{
throw Error.InvalidOperation(SRResources.MissingODataServices, nameof(IPerRouteContainer));
}
IServiceProvider rootContainer = perRouteContainer.GetODataRootContainer(routeName);
ODataBatchHandler batchHandler = rootContainer.GetRequiredService <ODataBatchHandler>();
await batchHandler.ProcessBatchAsync(context, next);
}
else
{
await this.next(context);
}
}
internal static Uri GetODataBatchBaseUri(this HttpRequest request, string oDataRouteName, IRouter route)
{
Contract.Assert(request != null);
if (oDataRouteName == null)
{
// Return request's base address.
return(new Uri(request.GetDisplayUrl()));
}
HttpContext context = request.HttpContext;
#if !NETSTANDARD2_0
// Here's workaround to help "EndpointLinkGenerator" to generator
ODataBatchPathMapping batchMapping = request.HttpContext.RequestServices.GetRequiredService <ODataBatchPathMapping>();
if (batchMapping.IsEndpointRouting)
{
context = new DefaultHttpContext
{
RequestServices = request.HttpContext.RequestServices,
};
IEndpointFeature endpointFeature = new ODataEndpointFeature();
endpointFeature.Endpoint = new Endpoint((d) => null, null, "anything");
context.Features.Set(endpointFeature);
context.Request.Scheme = request.Scheme;
context.Request.Host = request.Host;
}
context.Request.ODataFeature().RouteName = oDataRouteName;
#endif
// The IActionContextAccessor and ActionContext will be present after routing but not before
// GetUrlHelper only uses the HttpContext and the Router, which we have so construct a dummy
// action context.
ActionContext actionContext = new ActionContext
{
HttpContext = context,
RouteData = new RouteData(),
ActionDescriptor = new ActionDescriptor()
};
actionContext.RouteData.Routers.Add(route);
IUrlHelperFactory factory = request.HttpContext.RequestServices.GetRequiredService <IUrlHelperFactory>();
IUrlHelper helper = factory.GetUrlHelper(actionContext);
RouteValueDictionary routeData = new RouteValueDictionary()
{
{ ODataRouteConstants.ODataPath, String.Empty }
};
RouteValueDictionary batchRouteData = request.ODataFeature().BatchRouteData;
if (batchRouteData != null && batchRouteData.Any())
{
foreach (var data in batchRouteData)
{
routeData.Add(data.Key, data.Value);
}
}
string baseAddress = helper.Link(oDataRouteName, routeData);
if (baseAddress == null)
{
throw new InvalidOperationException(SRResources.UnableToDetermineBaseUrl);
}
return(new Uri(baseAddress));
}